I am digressing here, but what possible motive did Hitler have to invade Switzerland?
Hitler wasn't just "mad." He was at times a coldly calculating realist. What was there to be gained by occupying Switzerland? Very little if at all. In fact, there was a great deal to lose even if such an invasion were successful since the Swiss were a nice conduit of smuggled goods and semi-legitimate financial services.
While the Swiss have a well deserved reputation for courage in defending their homes. I really think that fact had very little to do with why Nazi Germany did not invade Switzerland.
For to win one hundred victories in one hundred battles is not the acme of skill. To subdue the enemy without fighting is the supreme excellence. Sun Tzu